ci: extend Java CI / E2E to release/v7

So that pull requests targeting release/v7 are properly gated by the
same checks as master, and pushes to release/v7 (i.e. merged bug fix
PRs and release commits) trigger CI for the 7.x line.

Without this, branch protection on release/v7 would block all merges
because no CI would ever fire to satisfy the required checks.

- build.yml + e2e.yml: add release/v7 to push branches

Author: confuser

.github/workflows/build.yml

@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - master
+      - release/v7
   schedule:
     - cron: "0 0 * * 0"
 

.github/workflows/e2e.yml

@@ -8,6 +8,7 @@ on:
   push:
     branches:
       - master
+      - release/v7
   workflow_dispatch:
 
 jobs: